Out of nowhere, my frames became connected, and now I cannot edit my frames! Any changes I make apply to all of them
When you have two keyframes with no change in their values, a dark yellow line connects them. When the values are different the line goes away. It is meant for you to know if there is a pause or a "hold" on the motion or whatever animated parameter you are displaying.

on the image all of the keframes are selected (showing as yellow). To edit just one deselect all and then just select the one you want to change.